The water vapor pressure of ambient air is 19 mmHg, and the wind speed is 1.7 m/s. Calculate the maximum evaporative heat loss (Emax in watts). (Assume skin temperature is 35°C; vapor pressure at 35°C is 42 mmHg., and a standard worker)

The water vapor pressure of ambient air is 19 mmHg, and the wind speed is 1.7 m/s. Calculate the maximum evaporative heat loss (Emax in watts). (Assume skin temperature is 35°C; vapor pressure at 35°C is 42 mmHg., and a standard worker)

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter6: Forced Convection Over Exterior Surfaces

Section: Chapter Questions

Problem 6.16P

See similar textbooks

Related questions

Q: A horizontal axis wind turbine with a 20-m diameter rotor is 30% efficient at 10 m/s winds and at 1…

A: Soln.

Q: A centrifuge bowl is to separate two immiscible liquids, one with SG 1.1 and the other with SG 0.9.…

Q: Use the thermal wind equation to explain the presence of the jet stream.

A: The Thermal Wind expression can be derived from the geopotential Equation as: Thermal wind is a…

Q: Air at 20°C, 1 atm flows with a velocity of 4.5 m/s over a flat plate having a sharp leading edge.…

A: Since we only answer up to 3 sub-parts, we’ll answer the first 3. Please resubmit the question and…

Q: Required information -0.5 where x Air flowing over a 1-m-long flat plate at a velocity of 7 m/s has…

A: To obtain the velocity gradient of air on the plate, we must first calculate the shear stress acting…

Q: A gasoline engine is at a location where the temperature is measured to be 14.8 °C and produces 300…

A: Gasoline engine: The internal combustion engine that runs on gasoline has the combustion chamber…

Q: In the laminar flow of air (Pr = 0.7) over a heated plate. if ö and S denote, respectively, the…

Q: Q1: Air at 300 K and 50 kPa flows over a 2-m-square plate at a velocity of 70 m/s. The plate is…

Q: A gasoline engine is at a location where the temperature is measured to be 14.2 °C and produces 347…

A: Gasoline engine: The gasoline engine is an internal combustion engine in which the air-fuel…

Q: Assuming that air is dry. A static air has a ground atmospheric pressure of 100 kPa and a surface…

Q: Discussion Explain how the stationary fluid flours when it becomes in touch with heated wall. You…

A: Stationary Fluid flows when in contact with heated wall. This is a fluid mechanics problems related…

Q: 8. If the dew point and temperature are both 0°C, and the pressure is 850 hPa, at what rate [K/km]…

Q: Calculate the average heat transfer coefficient in W/m2K Calculate the air velocity in m/s

Q: (c) The diameter of the piston and qutletof the paint sprayer in Fig. 1 is 6 cm and 0.5 cm,…

Q: What is the difference in force needed to stabilize a flat plate being sprayed with a jet of water…

A: The force exerted by jet depends on the area of jet or nozzle, velocity of jet coming out through…

Q: If forced convection uses Reynolds number to account for fluid movement during forced convection,…

A: Convection heat transfer: The heat transfer due to the motion of the fluid (air) is known as…

Q: For external forced convection with an isothermal surface, what is the Nu# correlation equation for…

A: Nusselt number (Nu) signifies the ratio of conductive resistance to the convective resistance…

Q: 55°C methanol flows over a 4m long 2m width flat plate with temperature of 25 C. The velocity of…

Q: Q1- Air at 1 atm and 27 C blows across a large concrete surface 15 m wide maintained at 55 C. The…

A: The mode of heat transfer in which molecules travels a certain distance to dissipate heat from one…

Q: Example 2: The local atmospheric pressure in Denver, Colorado (elevation 1610 m), is 83.4 kPa. Air…

Q: Helium at 20° C and low pressure flows around a thin plate 1 m long and 2 m wide. You want the…

A: Given, Length = L = 1 m Width = B = 2 m Temperature = T = 20 oC = 293 K Frictional resistance = F =…

Q: A 25-cm circular grill has an emissivity of 0.9. The temperature of the air and surrounding surfaces…

A: To determine the heat transfer from the grill, first of all we need to determine the Reynold number…

Q: 55°C methanol flows over a 4m long 2m width flat plate with temperature of 25°C. The velocity of…

A: Reynold's number Reynolds number is a dimensionless quantity that is used to determine the type of…

Q: QUESTION 1 a) Discuss the difference between static and dynamic temperatures. b) Define the…

A: Answer a: Write the difference between the static and dynamic temperatures: Static temperature…

Q: Figure 3 shows a large drinking water bottle equipped with a hose and a valve. One end of a 7 mm…

Q: Consider laminar flow of air across a hot circular cylinder. At what point on the cylinder will the…

A: Consider the diagrams shown below for the flow over a cylindrical body. As we can see from the…

Q: Volumetric thermal expansion is used in modeling natural convection heat transfer. Derive an…

Q: During flow over a given slender body such as a wing, the lift force, the upstream velocity, and the…

A: Answer : The lift force depends upon Density of fluid Upstream Velocity Size, shape and orientation…

Q: A boiling-water nuclear reactor vessel comprises a cylinder of length 20 m and diameter 5 m with…

A: Given that, Length of cylinder, L=20 m,Diameter of hemispherical end, d=5 m,Power generated, Q˙=1800…

Q: Air at 200C and at a pressure of 1 bar is flowing over a flat plate at a velocity of 3 m/s. If the…

A: Given: Pressure P=1 bar, velocityV=3 m/s, palate is w=0.280 m wide , temperatures are T1=200°C and…

Q: 6.18 Assuming a transition Reymolds number of 5 × 105, determine the distance from the leading edge…

A: Critical renoylds number is given asRec=ρu∞xcμxc=5×105μρu∞

Q: Calculate the heat transfer from a 60 cm x 60 cm plate on which air flows at 40 C and. The plate…

Q: Atmospheric air is in parallel flow (1 10 m/s, T 15°C) over a flat heater surface that is to be…

Q: How does the dynamic viscosity of (a) liquids and (b) gases vary with temperature?

A: Hi and thank you for the questions. Since you have asked multiple questions, we will answer the…

Q: A centrifuge bowl is to separate two immiscible liquids, one with SG 1.1 and the other with SG 0.9.…

Q: Using the equations for the Barometric Law and temperature decrease from adiabatic expansion (found…

A: Given Data h=5km T=288K γ=1.4 Using the Barometric Law as Follows

Q: How is the Reynolds number related to Darcy-Weisbach?

A: Reynolds number is used to determine the nature of the fluid, Laminar or turbulent fluid.

Q: Q3: A square flat plate of 1 m² area whose two surfaces temperature is 90 °C is cooled by air at 20…

Q: Ql:- (A) If your bicycle stays under the sunlight and on a hot day what will happen to the bicycle…

A: Given data, A bicycle is standing in a hot day outside. Assuming it's Tyre are filled perfectly…

Q: Air at 20°C, 1 atm flows with a velocity of 4.5 m/s over a flat plate having a sharp leading edge.…

A: Air Temperature, T∞=20oC Air Velocity, U∞=4.5m/s Plate Temperature, Ts=60oC

Q: Q3/Air at 0.5 atm pressure and 27 C flows across a 34-cm-square plate at a velocity of 20 m/s. The…

Q: Example 2B.2: A 15-cm by 15-cm circuit board is being cooled by air. It is dissipating 890 W/m² of…

Q: 1) Determine the height of chimney required in a boiler having natural draught equivalent to 25 mm…

A: Data given- Natural druaght hw = 25 mm Tg = 600 K Ta = 25°C = 298 K m = 15 kg

Q: Two 10-cm x 40-cm boards are mounted 2.5 cm apart as shown in Figure 7.29. Air at 20°C enters the…

A: Given: H=2.5 cm L=40cmm˙=0.04 kg/sTm,i=20oC Bulk mean temperature of fluid at…

Q: Subject: Thermodynamics The actual velocity of gas entering in a chimney is 8m/sec. The gas…

A: Given data: m˙=50000 kg/hv=8 m/sT=25°C=298 KP=98 kPa Need to determine the chimney diameter if mass…

Q: A 15-cm X 15-cm circuit board dissipating 15 W of power uniformly is cooled by air, which approaches…

A: According to the information we have a board that uniformly discharges 15 W of power is cooled at a…

Q: A 10-cm-diameter, 30-cm-high cylindrical bottle contains cold water at 3°C. The bottle is placed in…

A: Given:- Diameter of bottle=10cm height=30cm temp of cold water =3°C temp of air=27°C temp of water…

Concept explainers

Properties of Pure Substances

A substance with fixed chemical composition throughout is called a pure substance like water, air, and nitrogen. A pure substance does not have to be a single element or compound. A mixture of two or more phases of a pure substance is also a pure substance as long as the chemical composition is the same for all phases. These substances mainly have a constant/ uniform composition. The substances also have fixed boiling and melting points. A pure substance takes part in a chemical reaction to form predictable products.

Question

need some help with this one.
The water vapor pressure of ambient air is 19 mmHg, and the wind speed is 1.7 m/s. Calculate the
maximum evaporative heat loss (Emax in watts). (Assume skin temperature is 35°C; vapor pressure at
35°C is 42 mmHg., and a standard worker)
-53
O 232
O 232
O 30
O -30
O 53

Expert Solution

This question has been solved!

Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.

This is a popular solution!

SEE SOLUTION Check out a sample Q&A here

Step 1 Given data

VIEW

Step 2 Calculate the maximum evaporative loss

VIEW

Step 3 Result

VIEW

Trending now

This is a popular solution!

Step by step

Solved in 3 steps

SEE SOLUTION Check out a sample Q&A here

Knowledge Booster

Learn more about

Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, mechanical-engineering and related others by exploring similar questions and additional content below.

Similar questions

BOOK: FLUID POWER, 3e, JAMES A. SULLIVAN PROBLEM: 13 - 1
8. A coal fired steam boiler uses 3000 kg of coal per hour. Air required for combustion is 15.5 kg ofcoal at barometric pressure of 98.2 KPa. The flue gas has temperature of 285 degree Celsiusand an average molecular weight of 30. Assuming an ash loss of 11% and allowable gas velocityof 7.5 meters per second. Find the diameter of the chimney 9. The gas density is 0.75 kg per cubic meters and air density is of 1.15 kg per cubic meter. If thedriving pressure is 0.25 KPA. Determine the height of the chimney. 10. A powerplant situated at an altitude having an ambient air of 96.53 KPa and 23.88 degreeCelsius. Flue gases at a rate of 5.0 kg per second enter the stack at 200 degree Celsius andleaves at 160 degree Celsius. The flue gases gravimetric analysis are 18% CO2, 7% O2 and 75%N2. Calculate the height of the stack necessary for a driving pressure of 0.20 KPaKindly answer all please. Thank you
Air at standard pressure flows across a flat plate at 3m/s. The temperature surface is 50oC and the surrounding temperature is 20o Consider a point 1m away from the leading edge of the plate. See Table A-15 in Appendix 1 for properties of air. Find the local Nusselt number. Based on this Nusselt number, what is the local convective heat flux from the plate to the air?
4.2. The ball catathermometer factor (F) is 620, time while the spirit column drops from 38 to 350C in 100 seconds and the air temperature is 260C. Determine the air movement speed for the industrial section with these parameters.
You are designing an IC heatsink which uses round pins in cross-flow. The heatsink must dissipate 3000W. The heatsink has 10 rows of 8 columns of round pins with a diameter of 1mm. The pins have longitudinal and transverse pitch of 6mm. The incoming air is at 25oC with a velocity of 3 m/s. Assume fluid properties are constant. If the pins are arranged in-line: a) Find the Reynold’s Number b) Find the Nusselt Number c) If the pins are 30mm tall, how hot must the pin surface be (average) to dissipate the proper amount of heat?
In an Osborne Reynolds Demonstration experiment, why is it the in laminar flow, the color collected has a color unlike in transitional and turbulent flow where the color of liquid is just transparent?
Example 2: The local atmospheric pressure in Denver, Colorado (elevation 1610 m), is 83.4 kPa. Air at this pressure is 20°C flows with a velocity of 8 m/s over a 1.5 m  6 m flat plate whose temperature is 140°C (Figure). Determine the rate of heat transfer from the plate if the air flows parallel to the (a) 6-m-long side and (b) the 1.5-m side.
Air at standard pressure flows across a flat plate at 3m/s. The temperature surface is 50oC and the surrounding temperature is 20o Consider a point 1m away from the leading edge of the plate. See Table A-15 in Appendix 1 for properties of air. Determine the Reynold’s number and Prandtl number for this flow at the location described above. Determine the local flow boundary layer thickness. Determine the local thermal boundary layer thickness for this flow.
What is the friction loss in cm of water in a 2.44m diameter chimney 61m high up which gas is flowing at 9.14 m/sec? Gas density is 0.6776 kg/m3.
The flow velocity of air over a flat plate of dimension 1160 ×610 ×25 mm at 30 OC is 3.2 m/s. The top surface of the plate is maintained at 110 OC. Calculate the bottom temperature of the plate at steady state.
10. A powerplant situated at an altitude having an ambient air of 96.53 KPa and 23.88 degreeCelsius. Flue gases at a rate of 5.0 kg per second enter the stack at 200 degree Celsius andleaves at 160 degree Celsius. The flue gases gravimetric analysis are 18% CO2, 7% O2 and 75%N2. Calculate the height of the stack necessary for a driving pressure of 0.20 KPa
Calculate the air velocity at ports 1 and 2 if the water column pressure difference is 8.5 cm. Air and water have densities of 1.25 kg/m3 and 1000 kg/m3, respectively.